(Newser)
–
Do you line up bumper-to-bumper when approaching a traffic light? Though driver training groups say it's a no-no likely to increase one's risk of a collision, researchers at the Virginia Tech College of Engineering say it's a "widely accepted" practice based on the idea that "the closer a car is to a traffic light, the more likely that car will be to pass through the intersection before the light turns red again." The science behind that: Well, there isn't any. After recording footage of 10 volunteer drivers at traffic lights, researchers say in a release that those who stopped close to cars in front of them, and therefore closer to traffic lights, gained no advantage over drivers who stopped at a distance of up to 25 feet, because the former group had to establish space before accelerating once the light turned green.

The research, published in the New Journal of Physics, also confirmed that tailgating leads to more rear-end collisions. "When my father was teaching me how to drive, he told me that to prevent an accident, you should stop so you can easily see the rear bumper of the car in front of you at a traffic light," says researcher Farzad Ahmadi. But "I've never done that until I analyzed the data of this experiment." It shows "there's no point in getting closer to the car in front of you when traffic comes to a stop," adds study co-author Jonathan Boreyko. In other cases, it does pay to get close, however. A similar experiment performed using pedestrians found "the closer people got to each other, the faster they could empty the line" since humans can accelerate "very quickly," Boreyko says. (Stopping at red lights could also be bad for your respiratory and heart health.)

I was a driving instructor and worked for DOT. When you are stopped then being about a car's length from the person in front of you is not tailgating and not much of a safety issue. The exception would be that, ideally you would like to be far enough from the car in front so that you are not forced into that car if you are rear ended at a stop. So one strategy is to leave more space at first, and then creep up after a car or two has stopped behind you. As far as reasons for people not getting through a light, I would suggest inattentive lead drivers, lackadaisical driving when the light is green, and a general tendency to misjudge how much time is remaining as well as how long it takes to cover the distance to the light and through the intersection.

lou g

Nov 28, 2017 9:15 PM CST

Unfortunately, I found when I leave plenty of room between me and the vehicle in front of me, some idiot will squeeze in, usually causing me to tap on my brakes. At stop lights, this is also true, depending on how much space I put between me and the vehicle in front of me.